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arXiv 1606.09334astro-ph.SR
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超级太阳活动区12192是如何发生大规模局限耀斑的?

How did a Major Confined Flare Occur in Super Solar Active Region 12192?

Chaowei Jiang, Shi Tsan Wu, Vasyl B Yurchyshyn, Haimin Wang, Xueshang Feng, Qiang Hu

摘要:

我们研究了一个主要的X级太阳耀斑的物理机制,发生在超级NOAA活动区(AR)12192使用数据驱动的数值磁流体动力学(MHD)模型补充观测。利用观测到的太阳表面不断变化的磁场作为底边界输入,我们驱动磁流体系统与实际日冕演化相一致地自洽演化。在两天的时间间隔内,模拟的日冕场已经被光球场演化缓慢地应力化,逐渐产生了大规模的日冕电流片,即,一个狭窄的层与强烈的电流,在核心的AR。电流层不断增强,直到它变得如此之薄,以至于剪切的磁弧之间的系绳切割重联开始,这导致了耀斑。模型化的重连磁力线和它们的足点分别与观测到的热耀斑环和耀斑带很好地匹配,表明模型成功地“再现”了耀斑的宏观磁过程。特别是,通过模拟,我们解释了为什么这一事件是一个封闭的爆发-重联的结果是共享的拱廊,而不是一个新形成的通量绳。与其他X级耀斑相比,磁内爆效应要弱得多

英文摘要:

We study the physical mechanism of a major X-class solar flare that occurred in the super NOAA active region (AR) 12192 using a data-driven numerical magnetohydrodynamic (MHD) modeling complemented with observations. With the evolving magnetic fields observed at the solar surface as bottom boundary input, we drive an MHD system to evolve self-consistently in correspondence with the realistic coronal evolution. During a two-day time interval, the modeled coronal field has been slowly stressed by the photospheric field evolution,which gradually created a large-scale coronal current sheet, i.e., a narrow layer with intense current, in the core of the AR. The current layer was successively enhanced until it became so thin that a tether-cutting reconnection between the sheared magnetic arcades was set in, which led to a flare. The modeled reconnecting field lines and their footpoints match well the observed hot flaring loops and the flare ribbons, respectively, suggesting that the model has successfully "reproduced" the macroscopic magnetic process of the flare. In particular, with simulation, we explained why this event is a confined eruption-the consequent of the reconnection is the shared arcade instead of a newly formed flux rope. We also found much weaker magnetic implosion effect comparing to many other X-class flares

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